This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 60 |
| 4 | 509 |
| 5 | 5034 |
| 6 | 55689 |
| 7 | 674624 |
| 8 | 8838189 |
| 9 | 124199454 |
| 10 | 1861297049 |
| 11 | 29618273604 |
| 12 | 498716980989 |
| 13 | 8860512190034 |
| 14 | 165694162575369 |
| 15 | 3254269731689064 |
| 16 | 66994569450549869 |
| 17 | 1443024570035017254 |